In theory, you could play Invasion of Xerex to bounce something, use Yorion to blink the battlefield, and then use the battle to bounce Yorion, Sky Nomad, which would essentially let you blink your entire board each turn if you had enough mana
Thats still more expensive than Universes Within boxes of Play Boosters, simply by virtue of being, well, Final Fantasy
Any permanents will do, including lands, tokens, or even the planeswalker being attacked
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Stormtide Leviathan You dont have to worry about whether your opponent controls islands with Stormtide Leviathan on the board
he'd be good with either of the desert MTG commanders, for instance, or in a deck like Omnath